PATHETIC service and overcharging loyal, paying clients!!!

Despite VARIOUS queries sent via 808datavalidation, your Facebook page, and emails to customer "care" (no response obviously): You once again OVER charged me R346.65 for "data use" on my April invoice. I have a R750 cap, and a bill credit limit which I've tried 1000 times to amend, without success. I loaded a R99 2GB data bolt bundle on the 1st of April, because once I run out of data, I'm unable to use ANY internet/online services (Whatsapp, Internet, etc)...nothing! I could not reload another bundle (thanks, same credit limit value forever!!) and as a result I was OFF LINE until 8 April, when my new month's bill ran. How then can you charge me R346.65 on my April invoice for DATA that I could not possibly have used, given the pathetic systems you have in place and lack of response you provided when I queried this a week ago? I'm sick to death of your pathetic 808 staff, your DON'T CARE attitude and your flawed billing systems that you manage like amateurs! We pay you top dollar for this, month after month and on time. I'm entitled to better service but I expect that as usual, nobody will give any time or attention to customer queries. Staff just get paid to show up, right??